The act of trying to join a frat/soror. After rushing, the frat/soror may ask the rushee to pledge. The pledge must do whatever they are asked.

Sorority girl 1: Look at how cute our pledge is. She has to walk around campus wearing a bumblee costume and singing "Stars are blind."
Sorority girl 2: Yeah, we should make her eat dog food later. After pledging we don't even have to let her in.